limb flap and tiller

[clickerati]

Originally Posted by BorderBows

more than likely its the bolts moving, BH chnages, preload changes, limbs failing, are all things to consider in the "funny things"

In my case, it's not bolts moving. I mark mine so I would know if they'd moved and they haven't. The BH is also the same as it has been. As for limbs failing...how would one know if they are failing apart from delaminating or cracking?

[buzz lite beer]

that's the ticket give yourself something to worry about, your limbs are relativly new and settling in, adjust the tiller back to your previous settings and shoot.

[clickerati]

Originally Posted by buzz lite beer

that's the ticket give yourself something to worry about, your limbs are relativly new and settling in, adjust the tiller back to your previous settings and shoot.

aye aye cap'n!!

[AlanT]

Originally Posted by BorderBows

If the top of the tree is less dense, than the bottom, and no two trees are the same density, then it is possible that you have two limbs with different tree's in them, and with these mass production techneques there ends up a difference that can show in the balance of the limbs as the limbs loose a different range of averages over 3000 shots.

I can understand how this might cause a change in tiller over time as each core 'ages' differently. I hadn't really thought much about it.

I was just curious as to why a foam core limb might not experience such a change over time (apart from the perceived changes due to weather/temperature). Does foam not also 'age'/compress/whatever over time if, say, it came from a different batch for each limb?

Alan

[rod]

Originally Posted by Devon_Archer

when setting tiller don't measure the tiller until you have shot at least 10 arrows

my limbs don't settle to their natural position until at least 10 arrows are shot

and if you adjust, measure again only after 10 arrows

it is the only true way to get a true measurement

we only get 6 sighters

[Murray]

Originally Posted by rod

we only get 6 sighters

Sometimes, but in practice you can shoot as many arrows as you like. And if you're lucky you might even get 2 ends or more of practice.

[Old Bloke]

Funny thing this thread...in all the years of doing archery, when using wooden cored limbs, my sight marks never changesd..not when even using a dacron string. As soon as I started to use foam/carbon/this that and the other..hardly ever have I had sight marks the same from one day to the next.
It was only this weekend that I must have heard a dozen archers complaining about changes in sight marks..and you know what..it was a flat field, no wind and a measure of 90mts...probably just the same at their club.
I'm going back to wooden cored limbs with carbon interface.

[BorderBows]

There is no reason for these changes in our mind... but we dont use foam, or that style of construction so cant help.

AlanT
Wood cores dont age as such.
The reason for me saying this, is beacuse If a limb is made from the same plank, from the same tree and made properly, then the limbs should not loose poundage, or change independently over time. our customers say this to us.

Syntatic foam is a foam full of microspheres (glass spheres, are full of gas and are used in more quantity to keep the density down.). I have yet to meet a foam that does not loose its structure if compressed multiple times, with enough load, and this load is dependednt on density. You bed mattres, car seat, Life Jakets, and boyancy aids, Camping mattres. These are foams made in a different way, but the concept of bubbles means a weakness in our eyes.
If you take a set of limbs paired from a different batch to each other, then i can see a possibility for this "settling in" that archers are observing.

Things that we have seen alter weight of a limb made from the same machine settings on the same day.
Edge sawn or Flat sawn.
Top of tree/bottom of tree
Tree to tree as colder climates create closer grain/more dense wood, So this could include slope aspect.
Add that onto some fine tollerances and you can have a recipie for weight and balance issues if you have not matched the limbs properly.

We think mass producers see wood cores as a cheap option, and dont put the time in to them. We apply the same time to our synthetic limbs as we do our wood cores. This attention pays dividends in our eyes.

[AlanT]

Originally Posted by clickerati

..how would one know if they are failing apart from delaminating or cracking?

In my case, I first noticed a 'line' in the paint finish of the outside face of the lower limb about 6" from the riser. This suggested to me that someting was amiss in this area. A closer look at the edge of the laminate (between the foam core and the paint) revealed a crack which was clearly visible on both edges.

The limbs didn't appear to shoot 'badly' in any way, but they were immediately retired as I've seen what can happen when a limb lets go.

Alan